DE202022106171U1 - Impulse wire module and impulse wire module arrangement - Google Patents

Abstract

Impulse wire module (10;10') comprising:
- an impulse wire (12;12'),
- a wire winding (14; 14'), which is formed by a winding wire (16; 16') and radially encloses the impulse wire (12; 12'),
- a first ferrite element (22; 22') arranged at a first impulse wire end (18; 18') of the impulse wire (12; 12'), and
- a second ferrite element (24; 24') which is arranged at a second impulse wire end (20; 20') of the impulse wire (12; 12'), characterized in that
the first ferrite element (22; 22') and the second ferrite element (24; 24') each have an electrically conductive coating (30; 30'),
a first winding wire end (32; 32') of the winding wire (16; 16') is electrically connected to the electrically conductive coating (30; 30') of the first ferrite element (22; 22'), and
a second winding wire end (34; 34') of the winding wire (16; 16') is electrically connected to the electrically conductive coating (30; 30') of the second ferrite element (24; 24').

Description

The present invention relates to an impulse wire module comprising: an impulse wire, a wire winding which is formed by a winding wire and radially encloses the impulse wire, a first ferrite element which is arranged at a first impulse wire end of the impulse wire, and a second ferrite element which is arranged at a second impulse wire end of the impulse wire is arranged. The present invention further relates to an impulse wire module arrangement comprising: such an impulse wire module, and a printed circuit board with a first electrically conductive contact area and a second electrically conductive contact area.

Impulse wires within the meaning of the present invention are also referred to as Wiegand wires, are magnetically bistable and generally have a hard-magnetic sheath and a soft-magnetic core. Under the influence of an external magnetic field, the direction of magnetization of the impulse wire is suddenly inverted, whereby a short voltage pulse is generated in the wire winding radially enclosing the impulse wire, which can be tapped off via the two winding wire ends of the winding wire. This effect is referred to as the Wiegand effect and is well known in the prior art. Against this background, generic impulse wire modules are also referred to as Wiegand modules or Wiegand sensors.

Generic impulse wire modules are typically placed on a printed circuit board. For this reason, the impulse wire modules typically have special contacting devices that create an electrical connection between the two winding wire ends and corresponding electrically conductive contacting areas of the printed circuit board.

Such a pulse wire module is, for example, from DE 10 2020 100 732 A1 known. The pulse wire module disclosed comprises two essentially identical contacting devices, each of which is electrically connected to a winding wire end of the winding wire. The contacting devices each include a plurality of contacting elements, so-called "little legs", for the electrical connection of the corresponding winding wire end with correspondingly arranged electrically conductive contacting areas of the printed circuit board. However, the contacting devices disclosed are relatively large, so that a relatively large amount of space is required on the printed circuit board for the pulse wire module disclosed.

Against this background, the task is to create a compact impulse wire module or a compact impulse wire module arrangement.

This object is achieved by an impulse wire module according to the invention having the features of claim 1 and by an impulse wire module arrangement according to the invention having the features of claim 6 .

The impulse wire module according to the invention comprises an impulse wire, also referred to as a Wiegand wire, and a wire winding which radially encloses the impulse wire. The impulse wire is designed to be essentially linear, that is to say straight, with the wire winding radially enclosing a central axial section of the impulse wire. The pulse wire ends of the pulse wire thus protrude from the wire winding on one axial side of the latter.

The impulse wire module according to the invention also comprises two preferably substantially identical ferrite elements which have ferrimagnetic properties and typically consist of an electrically poorly or non-conductive ceramic material, typically of an iron oxide. The ferrite elements are arranged on the two pulse wire ends protruding axially from the wire winding, the first ferrite element being arranged on the first pulse wire end protruding from the wire winding on a first axial side and the second ferrite element on the second axial side opposite the first axial side the second end of the impulse wire protruding from the wire winding. The ferrite elements are typically cylindrical, but can in principle have any shape. For example, the ferrite elements can also be prism-shaped. Typically, the ferrite elements each include a central opening into which the respective pulse wire end dips or through which the respective pulse wire end extends. The impulse wire ends are preferably bonded to the corresponding ferrite element by means of a relatively soft adhesive which cures under UV light, for example silicone.

According to the invention, the first ferrite element and the second ferrite element each have an electrically conductive coating on an outside, with a first winding wire end of the winding wire being electrically connected to the electrically conductive coating of the first ferrite element and a second winding wire end of the winding wire being electrically connected to the electrically conductive coating of the second ferrite element is electrically connected. The electrically conductive coating can extend over the entire outer surface of the corresponding ferrite element or may only extend over part of the outer surface of the corresponding ferrite element. It is conceivable, for example, that the electrically conductive coating is only applied to one side of the corresponding ferrite element. In this case, the electrically conductive coating is preferably applied to both ferrite elements on the same side. The electrically conductive coating preferably consists of a metal or a metal alloy.

With the impulse wire module according to the invention, an electrical connection can be created between the two winding wire ends and corresponding electrically conductive contacting areas of a printed circuit board via the electrically conductive coatings of the two ferrite elements, so that no additional contacting devices are required for this. This creates a particularly compact impulse wire module.

The impulse wire module is typically mounted on a circuit board such that the axial direction of the impulse wire extends parallel to the surface of the circuit board. The electrically conductive coating of the first ferrite element and the electrically conductive coating of the second ferrite element are therefore preferably each arranged on a lateral surface of the corresponding ferrite element radially enclosing the pulse wire. The electrically conductive coating can extend over the entire lateral surface of the corresponding ferrite element or can only extend over part of the lateral surface of the corresponding ferrite element. In the second case, the electrically conductive coating is preferably applied to the same part of the outer surface of both ferrite elements. Due to the fact that the electrically conductive coating is arranged on the lateral surface of the respective ferrite element, the electrically conductive coatings of the two ferrite elements can be brought into direct physical contact with the corresponding electrically conductive contacting areas of the circuit board, which enables simple assembly of the impulse wire module on the circuit board and ensures a reliable electrical contact between the conductive coatings of the two ferrite elements and the corresponding electrically conductive contacting areas of the circuit board.

A minimum radial lateral surface diameter of the lateral surface of the first ferrite element and a minimum radial lateral surface diameter of the lateral surface of the second ferrite element are preferably each larger than a radial wire winding outer diameter of the wire winding. The wire winding therefore does not protrude beyond an outer edge of the ferrite elements in the radial direction of the pulse wire. This makes it possible to fasten the impulse wire module to the circuit board via the ferrite elements, so that no additional fastening elements have to be provided for this. This creates a particularly compact impulse wire module.

Preferably, the electrically conductive coating of the first ferrite element and the electrically conductive coating of the second ferrite element each consist of a copper-tin alloy. Copper-tin alloys adhere relatively well to the ferrite elements and have relatively good electrical conductivity. Furthermore, copper-tin alloys can generally be bonded to the materials typically used for the electrically conductive contact areas of the printed circuit board in a relatively simple and reliable manner.

Preferably, the first end of the winding wire is integrally connected to the electrically conductive coating of the first ferrite element and the second end of the winding wire is integrally connected to the electrically conductive coating of the second ferrite element. This creates a reliable electrical connection between the respective winding wire end and the corresponding electrically conductive coating, which can be produced in a relatively simple manner.

The electrically conductive coating of the first ferrite element and the electrically conductive coating of the second ferrite element preferably each have a groove, and the two winding wire ends of the wire winding are each arranged within the corresponding groove. The first end of the winding wire is therefore arranged in the groove of the electrically conductive coating of the first ferrite element, and the second end of the winding wire is arranged in the groove of the electrically conductive coating of the second ferrite element. The winding wire ends are preferably each arranged completely within the slot, which means that the winding wire ends do not protrude in the radial direction beyond a radial outer diameter of the respective coating. Particularly preferably, any welded joints that are present for fastening the winding wire ends to the respective electrically conductive coating are also arranged completely inside the groove. This makes it possible to place the impulse wire module with any area of the electrically conductive coating on a printed circuit board without causing damage to the winding wire ends or any welded connections that may be present. This enables a particularly simple assembly of the impulse wire on the printed circuit board.

The impulse wire module arrangement according to the invention comprises an impulse wire module according to the invention as described above and a printed circuit board with a first electrically conductive contact area and a second electrically conductive contact area.

According to the invention, the impulse wire module is arranged on the printed circuit board in such a way that the first ferrite element is arranged directly on the first electrically conductive contact area and the second ferrite element is arranged directly on the second electrically conductive contact area. In particular, the pulse wire module is arranged such that the electrically conductive coating of the first ferrite element is electrically connected to the first electrically conductive contact area and the electrically conductive coating of the second ferrite element is electrically connected to the second electrically conductive contact area. The electrically conductive coatings of the two ferrite elements are preferably each in direct physical contact with the corresponding electrically conductive contact area of the circuit board.

In the pulse wire module arrangement according to the invention, the two winding wire ends are connected to corresponding electrically conductive contacting areas of the printed circuit board via the electrically conductive coatings of the two ferrite elements, so that no additional contacting devices are required for this. This creates a particularly compact impulse wire module arrangement.

The electrically conductive coating of the first ferrite element is preferably bonded to the first electrically conductive contact area and the electrically conductive coating of the second ferrite element is bonded to the second electrically conductive contact area. The material connection creates a reliable electrical contact between the electrically conductive coatings of the ferrite elements and the electrically conductive contact areas of the printed circuit board. Furthermore, the impulse wire module is reliably fastened to the printed circuit board via the material connections between the electrically conductive coatings of the ferrite elements and the electrically conductive contacting areas, without additional fastening means having to be provided for this purpose.

• 1 eine schematische Darstellung eines ersten Ausführungsbeispiels einer erfindungsgemäßen Impulsdrahtmodulanordnung mit einem erfindungsgemäßen Impulsdrahtmodul in einer Seitenansicht zeigt,
• 2 eine Draufsicht auf eine Stirnseite des Impulsdrahtmoduls aus 1 zeigt,
• 3 eine schematische Darstellung eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Impulsdrahtmodulanordnung mit einem erfindungsgemäßen Impulsdrahtmodul in einer Seitenansicht zeigt,
• 4 eine Draufsicht auf eine Stirnseite des Impulsdrahtmoduls aus 3 zeigt.

Two exemplary embodiments of an impulse wire module arrangement according to the invention with an impulse wire module according to the invention are described below with reference to the accompanying figures, in which

• 1 shows a schematic representation of a first embodiment of an impulse wire module arrangement according to the invention with an impulse wire module according to the invention in a side view,
• 2 a plan view of an end face of the impulse wire module 1 shows,
• 3 shows a schematic representation of a second embodiment of an impulse wire module arrangement according to the invention with an impulse wire module according to the invention in a side view,
• 4 a plan view of an end face of the impulse wire module 3 shows.

The 1 and 2 show an impulse wire module arrangement 100 with an impulse wire module 10 and a circuit board 102.

The circuit board 102 includes a first electrically conductive contact area 104 and a second electrically conductive contact area 106, both of which are formed on a top side 108 of the circuit board 102.

The impulse wire module 10 includes a substantially linear impulse wire 12 that extends substantially parallel to the top surface 108 of the circuit board 102 .

The impulse wire module 10 comprises a wire winding 14, which is formed by a winding wire 16 and the impulse wire 12 surrounds radially. Specifically, the wire wrap 14 encloses only a central portion of the impulse wire 12 such that a first impulse wire end 18 of the impulse wire 12 protrudes from the wire wrap 14 on a first axial side and a second impulse wire end 20 of the impulse wire 12 protrudes from the wire wrap 14 on a second axial side .

The impulse wire module 10 includes two substantially identical cylindrical ferrite elements 22,24. The first ferrite element 22 is located at the first pulse wire end 18 and the second ferrite element 24 is located at the second pulse wire end 20 . The two ferrite elements 22,24 each have a central, axially extending ferrite element opening 26 through which the corresponding pulse wire end 18,20 extends. A minimum radial lateral surface diameter D1 of a lateral surface 28 of the two ferrite elements 22,24 radially enclosing the pulse wire 12 is greater than a radial wire winding outer diameter D2 of the wire winding 14. The two ferrite elements 22,24 each have an essentially union parallel to the axial direction of the pulse wire 12 extending ferrite element groove 29.

The two ferrite elements 22, 24 each have an electrically conductive coating 30, which consists of a copper-tin alloy in the present exemplary embodiment. The electrically conductive coating 30 is in each case applied to the lateral surface 28 of the corresponding ferrite element 22,24. The electrically conductive coating 30 is formed in each case in such a way that a coating groove 31 is present in the electrically conductive coating 30 at the location of the ferrite element groove 29 of the respective ferrite element 22 , 24 .

A first winding wire end 32 of the winding wire 16 is arranged in the coating groove 31 of the electrically conductive coating 30 of the first ferrite element 22 and is electrically connected to the electrically conductive coating 30 of the first ferrite element 22, and a second winding wire end 34 of the winding wire 16 is in the coating -Nut 31 of the electrically conductive coating 30 of the second ferrite element 24 is arranged and electrically connected to the electrically conductive coating 30 of the second ferrite element 24 . The winding wire ends 16, 18 are each arranged completely inside the corresponding coating groove 31, ie they do not protrude radially beyond a coating outer diameter D3 of the respective electrically conductive coating 30. In the present exemplary embodiment, the two winding wire ends 32 , 34 are each bonded to the electrically conductive coating 30 of the corresponding ferrite element 22 , 24 , with the bonded connection also being arranged completely within the coating groove 31 .

The impulse wire module 10 is arranged on the printed circuit board 102 in such a way that the first ferrite element 22 is arranged on the first electrically conductive contact area 104 and the second ferrite element 24 is arranged on the second electrically conductive contact area 106 . In the present exemplary embodiment, the electrically conductive coating 30 of the first ferrite element 22 is materially connected to the first electrically conductive contacting area 104 , and the electrically conductive coating 30 of the second ferrite element 24 is materially connected to the second electrically conductive contacting area 106 . The electrically conductive coating 30 of the first ferrite element 22 is therefore electrically connected to the first electrically conductive contacting area 104 , and the electrically conductive coating 30 of the second ferrite element 24 is electrically connected to the second electrically conductive contacting area 106 .

The 3 and 4 show an impulse wire module arrangement 100' with an impulse wire module 10' and a printed circuit board 102', with the corresponding reference number from FIGS 1 and 2 with a trailing apostrophe character.

The impulse wire module arrangement 100' differs from the impulse wire module arrangement 100 essentially in that the two ferrite elements 22', 24' of the impulse wire module 10' are cuboid and have no groove.

With the exception of the shape of the ferrite elements 22', 24', the structure of the pulse wire module arrangement 100' basically corresponds to the previously described structure of the pulse wire module arrangement 100 from FIGS 1 and 2 .

Reference List

10; 10'

impulse wire module

12; 12'

impulse wire

14; 14'

wire wrap

16; 16'

winding wire

18; 18'

first impulse wire end

20;20'

second impulse wire end

22;22'

first ferrite element

24; 24'

second ferrite element

26;26'

ferrite element openings

28;28'

lateral surfaces

29

Ferrite Element Groove

30;30'

electrically conductive coatings

31

coating groove

32;32'

first winding wire end

34;34'

second winding wire end

100; 100'

impulse wire module arrangement

102; 102'

circuit board

104; 104'

first electrically conductive contact area

106; 106'

second electrically conductive contact area

108; 108'

top

D1; D1'

minimum radial lateral surface diameter

D2;D2'

radial wire wrap outer diameter

D3

radial coating outer diameter

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102020100732 A1 [0004]

Claims (8)

Impulse wire module (10; 10') comprising: - an impulse wire (12; 12'), - a wire winding (14; 14'), which is formed by a winding wire (16; 16') and the impulse wire (12; 12') radially enclosing, - a first ferrite element (22; 22') arranged at a first pulse wire end (18; 18') of the pulse wire (12; 12'), and - a second ferrite element (24; 24') arranged at a second impulse wire end (20; 20') of the impulse wire (12; 12'), characterized in that the first ferrite element (22; 22') and the second ferrite element (24; 24') each have an electrically conductive coating (30 ;30'), a first winding wire end (32;32') of the winding wire (16;16') is electrically connected to the electrically conductive coating (30;30') of the first ferrite element (22;22'), and a second winding wire end (34; 34') of the winding wire (16; 16') is electrically connected to the electrically conductive coating (30; 30') of the second ferrite element (24; 24'). Impulse wire module (10;10') according to claim 1 , wherein the electrically conductive coating (30; 30') of the first ferrite element (22; 22') and the electrically conductive coating (30; 30') of the second ferrite element (24; 24') each on a pulse wire (12; 12 ') radially enclosing lateral surface (28; 28') of the corresponding ferrite element (22, 24; 22', 24'). Impulse wire module (10;10') according to claim 2 , wherein a minimum radial lateral surface diameter (D1; D1') of the lateral surface (28; 28') of both ferrite elements (22, 24; 22', 24') is larger in each case than a radial wire winding outer diameter (D2; D2') of the wire winding (14 ;14'). An impulse wire module (10;10') according to any one of the preceding claims, wherein the electrically conductive coating (30;30') of the first ferrite element (22;22') and the electrically conductive coating (30;30') of the second ferrite element (24; 24') each consist of a copper-tin alloy. Impulse wire module (10; 10') according to one of the preceding claims, wherein the first winding wire end (32; 32') is materially connected to the electrically conductive coating (30; 30') of the first ferrite element (22; 22') and the second winding wire end (34; 34') is materially connected to the electrically conductive coating (30; 30') of the second ferrite element (24; 24'). Pulse wire module (10) according to one of the preceding claims, wherein the electrically conductive coating (30) of the first ferrite element (22) and the electrically conductive coating (30) of the second ferrite element (24) each have a groove (31), and wherein the winding wire ends (32,34) are each arranged within the corresponding groove (31). Pulse wire module assembly (100;100') comprising: - an impulse wire module (10;10') according to any one of the preceding claims, and - a printed circuit board (102; 102') with a first electrically conductive contact area (104; 104') and a second electrically conductive contact area (106; 106'), the first ferrite element (22; 22') on the first electrically conductive contact area (104; 104') and the second ferrite element (24; 24') is arranged on the second electrically conductive contact area (106; 106') in such a way that the electrically conductive coating (30; 30') of the first ferrite element ( 22; 22') is electrically connected to the first electrically conductive contact area (104; 104') and the electrically conductive coating (30; 30') of the second ferrite element (24; 24') is electrically connected to the second electrically conductive contact area (106; 106 ') is electrically connected. Impulse wire module arrangement (100; 100') according to claim 7 , wherein the electrically conductive coating (30; 30') of the first ferrite element (22; 22') is cohesively connected to the first electrically conductive contact area (104; 104') and the electrically conductive coating (30; 30') of the second ferrite element (24; 24') is cohesively connected to the second electrically conductive contact area (106; 106').

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